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CFn: raise validation error if the template is not valid #13377

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CFn: raise validation error if the template is not valid #13377

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@simonrw simonrw commented Nov 13, 2025

Motivation

When submitting invalid templates, the CloudFormation template parser raises a 500 internal server error rather than a 400 validation error.

Changes

Raise validation error instead

Tests

Related

@simonrw simonrw added semver: patch Non-breaking changes which can be included in patch releases docs: skip Pull request does not require documentation changes notes: skip Pull request does not have to be mentioned in the release notes labels Nov 13, 2025
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github-actions bot commented Nov 13, 2025

Test Results - Preflight, Unit

22 309 tests  ±0   20 555 ✅ ±0   6m 45s ⏱️ +29s
     1 suites ±0    1 754 💤 ±0 
     1 files   ±0        0 ❌ ±0 

Results for commit 85010a1. ± Comparison against base commit c1abe8d.

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github-actions bot commented Nov 13, 2025

Test Results (amd64) - Acceptance

7 tests  ±0   5 ✅ ±0   3m 27s ⏱️ +8s
1 suites ±0   2 💤 ±0 
1 files   ±0   0 ❌ ±0 

Results for commit 85010a1. ± Comparison against base commit c1abe8d.

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github-actions bot commented Nov 13, 2025

LocalStack Community integration with Pro

  2 files  ±    0    2 suites  ±0   35m 8s ⏱️ - 1h 26m 44s
586 tests  - 4 352  471 ✅  - 4 088  114 💤  - 265  1 ❌ +1 
588 runs   - 4 352  471 ✅  - 4 088  116 💤  - 265  1 ❌ +1 

For more details on these failures, see this check.

Results for commit 85010a1. ± Comparison against base commit c1abe8d.

This pull request removes 4353 and adds 1 tests. Note that renamed tests count towards both. 
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_lambda_dynamodb
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_opensearch_crud
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_search_books
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_setup
tests.aws.scenario.kinesis_firehose.test_kinesis_firehose.TestKinesisFirehoseScenario ‑ test_kinesis_firehose_s3
tests.aws.scenario.lambda_destination.test_lambda_destination_scenario.TestLambdaDestinationScenario ‑ test_destination_sns
tests.aws.scenario.lambda_destination.test_lambda_destination_scenario.TestLambdaDestinationScenario ‑ test_infra
tests.aws.scenario.loan_broker.test_loan_broker.TestLoanBrokerScenario ‑ test_prefill_dynamodb_table
tests.aws.scenario.loan_broker.test_loan_broker.TestLoanBrokerScenario ‑ test_stepfunctions_input_recipient_list[step_function_input0-SUCCEEDED]
tests.aws.scenario.loan_broker.test_loan_broker.TestLoanBrokerScenario ‑ test_stepfunctions_input_recipient_list[step_function_input1-SUCCEEDED]
…

tests.aws.services.cloudformation.api.test_templates ‑ test_create_stack_invalid_yaml_template_should_fail

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Test Results (amd64) - Integration, Bootstrap

  5 files  ±    0    5 suites  ±0   49m 7s ⏱️ - 1h 51m 53s
610 tests  - 4 702  496 ✅  - 4 277  113 💤  - 426  1 ❌ +1 
616 runs   - 4 702  496 ✅  - 4 277  119 💤  - 426  1 ❌ +1 

For more details on these failures, see this check.

Results for commit 85010a1. ± Comparison against base commit c1abe8d.

This pull request removes 4703 and adds 1 tests. Note that renamed tests count towards both. 
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_lambda_dynamodb
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_opensearch_crud
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_search_books
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_setup
tests.aws.scenario.kinesis_firehose.test_kinesis_firehose.TestKinesisFirehoseScenario ‑ test_kinesis_firehose_s3
tests.aws.scenario.lambda_destination.test_lambda_destination_scenario.TestLambdaDestinationScenario ‑ test_destination_sns
tests.aws.scenario.lambda_destination.test_lambda_destination_scenario.TestLambdaDestinationScenario ‑ test_infra
tests.aws.scenario.loan_broker.test_loan_broker.TestLoanBrokerScenario ‑ test_prefill_dynamodb_table
tests.aws.scenario.loan_broker.test_loan_broker.TestLoanBrokerScenario ‑ test_stepfunctions_input_recipient_list[step_function_input0-SUCCEEDED]
tests.aws.scenario.loan_broker.test_loan_broker.TestLoanBrokerScenario ‑ test_stepfunctions_input_recipient_list[step_function_input1-SUCCEEDED]
…

tests.aws.services.cloudformation.api.test_templates ‑ test_create_stack_invalid_yaml_template_should_fail

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Test Results - Alternative Providers

585 tests   - 875   330 ✅  - 477   23m 36s ⏱️ - 12m 44s
  1 suites  -   4   254 💤  - 399 
  1 files    -   4     1 ❌ +  1 

For more details on these failures, see this check.

Results for commit 85010a1. ± Comparison against base commit c1abe8d.

This pull request removes 876 and adds 1 tests. Note that renamed tests count towards both. 
tests.aws.services.cloudwatch.test_cloudwatch.TestCloudWatchMultiProtocol ‑ test_basic_operations_multiple_protocols[json]
tests.aws.services.cloudwatch.test_cloudwatch.TestCloudWatchMultiProtocol ‑ test_basic_operations_multiple_protocols[query]
tests.aws.services.cloudwatch.test_cloudwatch.TestCloudWatchMultiProtocol ‑ test_basic_operations_multiple_protocols[smithy-rpc-v2-cbor]
tests.aws.services.cloudwatch.test_cloudwatch.TestCloudWatchMultiProtocol ‑ test_exception_serializing_with_no_shape_in_spec[json]
tests.aws.services.cloudwatch.test_cloudwatch.TestCloudWatchMultiProtocol ‑ test_exception_serializing_with_no_shape_in_spec[query]
tests.aws.services.cloudwatch.test_cloudwatch.TestCloudWatchMultiProtocol ‑ test_exception_serializing_with_no_shape_in_spec[smithy-rpc-v2-cbor]
tests.aws.services.cloudwatch.test_cloudwatch.TestCloudWatchMultiProtocol ‑ test_multi_protocol_client_fixture[json]
tests.aws.services.cloudwatch.test_cloudwatch.TestCloudWatchMultiProtocol ‑ test_multi_protocol_client_fixture[query]
tests.aws.services.cloudwatch.test_cloudwatch.TestCloudWatchMultiProtocol ‑ test_multi_protocol_client_fixture[smithy-rpc-v2-cbor]
tests.aws.services.cloudwatch.test_cloudwatch.TestCloudwatch ‑ test_alarm_lambda_target
…

tests.aws.services.cloudformation.api.test_templates ‑ test_create_stack_invalid_yaml_template_should_fail

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@pinzon pinzon Awaiting requested review from pinzon pinzon will be requested when the pull request is marked ready for review pinzon is a code owner

@dominikschubert dominikschubert Awaiting requested review from dominikschubert dominikschubert will be requested when the pull request is marked ready for review dominikschubert is a code owner

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docs: skip Pull request does not require documentation changes notes: skip Pull request does not have to be mentioned in the release notes semver: patch Non-breaking changes which can be included in patch releases

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@simonrw